Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986baicz..37..107a&link_type=abstract
Astronomical Institutes of Czechoslovakia, Bulletin (ISSN 0004-6248), vol. 37, March 1986, p. 107-111.
Astronomy and Astrophysics
Astronomy
3
H Alpha Line, Solar Flares, Solar Radio Bursts, Solar X-Rays, Chromosphere, Temporal Distribution, Type 2 Bursts, Type 3 Bursts, Type 4 Bursts
Scientific paper
The means durations of 906 H-alpha flares were calculated as a function of their radio, X-ray, and areal characteristics, and a similar calculation was performed for the durations of 215 soft X-ray flares. It was found that H-alpha flares associated only with type II radio bursts have, on the average, shorter durations than flares associated with type IV radio emissions. The duration of the soft X-ray flares is related to a much hotter plasma, probably located in the geometrically higher layers of the flare as compared with the H-alpha flares. The soft flares associated only with type II radio bursts have an average duration smaller than that of flares associated with a type IV radio emission. The group of flares associated with type III radio bursts can be considered as a standard case of thermal flares, have a mean duration which does not depend on flare area. The mean duration is 40 minutes for M-flares and 60 minutes for X-flares.
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